commands not working

when I run commands in windows 2000 server command prompt, like 'dcdiag', 'dnscmd', etc it is giving the following error: 'dcdiag' is not recognized as an internal or external command. Operable program or batch file.

Even I have installed admin pack but still not working, what to do now?

im having a issue, Getting any commands to work in a Command DOS
prompt: ipconfig / ping / Etc does not work whenever i goto a dos
prompt from a run > command.exe
but if i click on the Command in widows such as ipconfig.exe it briefly
shows then goes away : have i got a enviroment Variable messed up
somewhere?

Regards Lee
A few questions to answer before posting:
What does the error say? Does it have an error code? e.g 0x0000008e, Which
Software Version are you using? e.g Office 2003, What is the make and model
of the hardware? Epson R300 printer etc, What was the last thing you did or
installed before the problem started? What have you already done?
What NOT to say:
My PC isn't working can you help me? Vague questions get Vague answers

What TO say:
If someone gives you the solution to your problem thank them, also thank the
other people who took the time to help you. Tell everyone the the solution,
when a variety of solutions have been suggested we need to know which one
worked and if you did any additional work.

You don't 'have' to type CMD you can still get info from Command but CMD is
XP's proprietary command prompt, although you can still use 'Command' if
required for compatibility purposes.

Regards Lee

A few questions to answer before posting:
What does the error say? Does it have an error code? e.g 0x0000008e, Which
Software Version are you using? e.g Office 2003, What is the make and model
of the hardware? Epson R300 printer etc, What was the last thing you did or
installed before the problem started? What have you already done?

What NOT to say:
My PC isn't working can you help me? Vague questions get Vague answers

What TO say:
If someone gives you the solution to your problem thank them, also thank the
other people who took the time to help you. Tell everyone the solution, and
before you send the post add **SOLVED** to the post subject.
When a variety of solutions have been suggested we need to know which one
worked and if you did any additional work. Just remember you may come across
your problem again and knowing where to find a good solution is priceless.